Among the dead were four Saudi citizens, two Bangladeshi nationals, and one each from Egypt, Jordan, Syria, Palestine, and Sudan. A U.S. citizen also was killed. The attack is the deadliest in any Gulf Arab country since the start of the war with Iran, whose regional proxy, the Houthi rebels in Yemen, have been escalating attacks on Saudi infrastructure.

The missile hit a complex housing terminals 3 and 4 for domestic flights, a regional official said, speaking on condition of anonymity because they were not authorized to speak to the media. The airport suspended operations through midnight, with flights diverted elsewhere. All entrances were blocked, and lights around the complex were dimmed.

President Donald Trump said he was evaluating whether the U.S. should join Saudi strikes against the Houthis. “We may. We’re going to look at it,” Trump said. “We just found out about the recent attack. So we’ll make a decision. We move very quickly.”

The attack is the third on the airport in a week, following earlier strikes that killed four people and damaged an aircraft. The Houthi rebels have not yet claimed responsibility for the latest strike but did claim earlier attacks on the same airport. They also accused Saudi Arabia earlier Saturday of striking Sanaa International Airport in Houthi-held Yemen.

The Saudi energy ministry continued to promote a major international energy conference set to begin in Riyadh on Sunday despite the violence.

Regional officials told the AP that Saudi Arabia is running low on missile interceptors and has asked France, Britain, Pakistan and Egypt to deploy air defense support. One official noted that the U.S. has also seen its stock dwindle during the war with Iran.

A U.S. State Department spokesperson said the department was in close contact with its “Saudi partners” and condemned “Houthi terrorist attacks against civilian infrastructure and airports.”

The Houthi rebels have accused Saudi Arabia of imposing a blockade on Yemen and have previously attacked ships in the Red Sea, calling it solidarity with Palestinians. A U.S. bombing campaign curtailed that activity.

The Houthis also warned global airlines “for the last time” about the potential consequences of operating in Saudi airspace, which they described as a theater for their military operations. At least 291 flights at the Riyadh airport had been canceled over the past 24 hours, according to FlightAware.